Aerodynamic response of structures with parametric uncertainties |
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Authors: | Ahsan Kareem |
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Affiliation: | 1. Department of Civil Engineering, The University of Akron, Akron, OH 44321, USA;2. Air Force Research Laboratory, 2941 Hobson Way, WPAFB, OH 45433, USA;3. University of Dayton Research Institute, 300 College Park, Dayton, OH 45469, USA;1. Key Laboratory of Brain Functional Genomics (MOE & STCSM), Key Laboratory of Magnetic Resonance, Institute of Cognitive Neuroscience, School of Psychology and Cognitive Science, East China Normal University, Shanghai 20062, China;2. Shanghai Medical Instrumentation College, University of Shanghai Science and Technology, Shanghai 200093, China;3. Center for Developmental Neuropsychiatry, Columbia University Department of Psychiatry & New York State Psychiatric Institute, Unit 74, 1051 Riverside Drive, New York, NY 10032, USA;4. Epidemiology Division & MRI Unit, Columbia University Department of Psychiatry & New York State Psychiatric Institute, Unit 24, 1051 Riverside Drive, New York, NY 10032, USA;1. College of Civil Engineering, Tongji University, China;2. Key Laboratory of Performance Evolution and Control for Engineering Structures (Tongji University), Ministry of Education of P.R.C, China |
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Abstract: | Uncertainties associated with the load effects and dynamic characteristics of wind-excited structures have been identified and discussed. Based on the available experimental data from laboratory and field study measurements the variability of the parameter space categorized as wind environment and meteorological data, wind-structure interaction and structural properties has been assessed. The probabilistic dynamic response of a wind-excited structyre has been expressed in terms of uncertain parameters. The influence of uncertainty in these parameters has been propagated in accordance with the functional relationships that relate them to the structural response. In this study, the propagation of uncertainty has been obtained by employing the Second-Moment and Monte Carlo simulation techniques. The dynamic response of a chimney subjected to aerodynamic loads is presented to illustrate the treatment of uncertainty in the parameter space. The mean and coefficient of variation of the peak chimney response, in terms of top deflections and associated base bending moments, exhibit close agreement between the Second-Moment and simulation techniques. A sensitivity analysis has been conducted which delineates the relative significance of uncertainty in the several parameters, related to both load effects and structural characteristics, on the overall uncertainty in the aerodynamic response of a chimney. The uncertainty associated with both response components suggests a need for further improvement in the modeling of wind-structure interaction, prediction of natural frequencies and damping, and reduction in the variability of extreme wind estimates. There are immediate applications of the procedures discussed in this paper for a variety of wind-sensitive structures. |
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